EP2901427B1 - Verfahren zur prüfung eines wertdokuments, wertdokument, verwendung desselben und wertdokumentsystem - Google Patents

Verfahren zur prüfung eines wertdokuments, wertdokument, verwendung desselben und wertdokumentsystem Download PDF

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Publication number
EP2901427B1
EP2901427B1 EP13770840.0A EP13770840A EP2901427B1 EP 2901427 B1 EP2901427 B1 EP 2901427B1 EP 13770840 A EP13770840 A EP 13770840A EP 2901427 B1 EP2901427 B1 EP 2901427B1
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EP
European Patent Office
Prior art keywords
value document
luminescent
luminescent particles
distribution
luminescence intensities
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EP13770840.0A
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German (de)
English (en)
French (fr)
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EP2901427A1 (de
Inventor
Thomas Giering
Johann Kecht
Wolfgang Rauscher
Stephan Steinlein
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Giesecke and Devrient Currency Technology GmbH
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Giesecke and Devrient Currency Technology GmbH
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Publication of EP2901427A1 publication Critical patent/EP2901427A1/de
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Classifications

    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
    • G07D7/12—Visible light, infrared or ultraviolet radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29—Securities; Bank notes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/378—Special inks
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/64—Fluorescence; Phosphorescence
    • G01N21/645—Specially adapted constructive features of fluorimeters
    • G01N21/6456—Spatial resolved fluorescence measurements; Imaging
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
    • G07D7/12—Visible light, infrared or ultraviolet radiation
    • G07D7/1205—Testing spectral properties
    • B42D2033/14—
    • B42D2035/34—

Definitions

  • the invention relates to a method for checking the authenticity and / or the nominal value of a value document with luminescent feature substances.
  • the invention also relates to the use of a value document in the method.
  • Host grids doped with rare earth metals are preferably used, the absorption and emission ranges being able to be varied within a wide range by suitable coordination of rare earth metals and host grids.
  • the use of magnetic and electrically conductive materials to ensure authenticity is also known. Magnetism, electrical conductivity and luminescence emission can be detected mechanically by means of commercially available measuring devices, luminescence when emitted in the visible range can also be detected visually to a sufficient extent.
  • the WO 2005/036481 A1 describes a device and a method for checking documents of value with luminescent feature substances. By carrying out the evaluation of the detected luminescence radiation on the basis of an integrated luminescence measurement, ie by integrating the measured luminescence radiation of a track extending across the document of value, particularly easy detection and differentiation of weakly illuminating feature substances is possible.
  • From the DE 10 2005 033 598 A1 is a sheet-shaped value document with luminescent feature substances and the production and testing of a such value document known.
  • the document of value described therein contains a luminescent feature substance, which is present both over the entire area with a low concentration and on certain partial areas with a higher concentration.
  • the DE 10 2005 033598 A1 describes a sheet-shaped document of value with luminescent feature substance and the production and testing of such a document of value.
  • the authenticity check is checked by taking measured values from the checked value document and evaluating them to determine whether the feature substance is present both over the entire area with a low concentration and also on certain partial areas with a higher concentration.
  • the properties of the distributions can also be determined for a more selective detection.
  • the statistical key figures of the distributions for example mean values and standard deviations, quantiles or other statistical parameters, are suitable as additional criteria for checking.
  • both the distributions can be examined according to the specifications and the statistical deviations from these (see paragraphs [0019] and [0020] of DE 10 2005 033598 A1 ).
  • the present invention is based on the object of providing a document of value which is improved with respect to security against forgery and a method for checking the presence of the same.
  • the location-dependent luminescence data is preferably evaluated using methods of descriptive statistics. For example, a banknote is rasterized pixel by pixel, or on several, randomly selected positions, measured, and calculated from the resulting data one or more of the following key figures from the field of descriptive statistics. These are then compared with threshold values for sorting or determining the authenticity of the banknotes.
  • a threshold value (alternatively also referred to as a threshold or limit value) designates a certain absolute or relative numerical value, above or below which a different classification is made in the classification of the value document, for example the distinction between genuine / spurious value documents or the division into different ones Denominations and / or currencies.
  • the descriptive statistics subdivide parameters, among other things, into location measures such as mean, median and quantiles, as well as scatter measures (also known as dispersion measures) such as standard deviation, mean absolute deviation and interquartile range. At least one parameter from the range of the scattering dimensions is used to evaluate the location-dependent luminescence data. Intensity-corrected scattering measures are used, i.e. the scattering measures are standardized or corrected with the help of positional measures. Another area of descriptive statistics is shape measures such as skewness and quartile skewness of a distribution. These are preferably used for the analysis of luminescence intensity distributions which have a right or left skew.
  • Such distributions can be generated, for example, by using right or left slate monomodal or bimodal or polymodal grain size distributions of luminophores.
  • methods from the field of numerical classification methods are preferably used, these being preferably applied to frequency distribution data.
  • a banknote is rastered pixel by pixel, or measured at several, randomly selected locations, and the resulting intensity values are divided into n frequency classes, so that a frequency vector is obtained as an n-tuple for each banknote.
  • This vector corresponds to a point in the n-dimensional space R n .
  • the point clouds in this space obtained in this way with a large number of notes can be evaluated particularly advantageously with methods of the numerical classification method in order to divide the bank notes into different classifications such as real / fake or different denominations and / or currencies.
  • suitable numerical classification methods are statistical classification, nearest neighbor classification, cuboid classification, the polynomial classifier, support vector machines (SVM), and neural networks.
  • Valuable documents in the context of the invention are objects such as banknotes, checks, shares, tokens, ID cards, passports, credit cards, certificates and other documents, labels, seals, and objects to be secured such as CDs, packaging and the like.
  • the preferred field of application is banknotes, which are based in particular on a paper substrate.
  • the luminescent particles can e.g. are based on an inorganic solid which forms a matrix and is doped with one or more rare earth metals or transition metals.
  • the particles are in the non-visible spectrum, i.e. emit in the UV or NIR range (the abbreviation "NIR” denotes the term “near infrared”).
  • NIR near infrared
  • the particles have at most a grain size of 30 microns, particularly preferably at most a grain size of 20 microns.
  • the authenticity determination of a luminescent authenticity feature is conventionally carried out by means of suitable sensors which detect the luminescence at at least one location, generally at several locations, of the value document by excitation with light of a suitable wavelength.
  • suitable sensors which detect the luminescence at at least one location, generally at several locations, of the value document by excitation with light of a suitable wavelength.
  • it would be desirable to measure a constant luminescence signal at all potential measuring points of the value document for example to detect a homogeneous luminescence signal over the entire paper body of a banknote.
  • this is favored by a high luminophore concentration and a large measuring area, since there is a high number of measurements for each measurement is captured by luminophore particles and thus a good averaging arises.
  • a finer pigment (A1) is produced by grinding in a stirred ball mill, and a coarser pigment (A3) by controlled agglomeration (see Table 1).
  • Table 1 Grain sizes (the data D50, D90 and D99 indicate that 50%, 90% and 99% of the particles with a grain size distribution have grain sizes that are smaller than or equal to the specified value) description D50 [ ⁇ m] D90 [ ⁇ m] D99 [ ⁇ m] A1 0.3 1.4 2.2 A2 2.4 7 11.4 A3 11 17 20
  • a sheet of paper was then produced in a sheet former, with 2 parts per thousand (A1) or 1 part per thousand (A2, A3) per part by weight of feature substance.
  • the sheets containing the feature were then measured using a sensor.
  • Figures 7 . 9 and 11 show the measurement signals of the leaves. Several measurement points were measured at different points on the sheet, and the measurement signals determined from successive measurement points were connected with a line (measurement series). The Figures 7 . 9 and 11 each show the superimposition of a large number of such measurement series.
  • the absolute value of the difference between a measurement signal and the previous measurement signal is plotted.
  • the three different series of measurements bear different symbols for better differentiation: white triangles, gray squares and black circles.
  • a parameter for the fluctuation of the measurement signal is e.g. the average of the absolute values of these differences when measuring series of measurements with 90 measuring points. There are clear differences here for the respective samples, the mean value of the parameter followed by its standard deviation between several series of measurements being given below: A1 (mean value: 16 ⁇ 2); A2 (mean: 45 ⁇ 4); A3 (mean: 96 ⁇ 8).
  • a second preferred embodiment is based on mixing different particle classes with different luminosities.
  • a luminescent authenticity feature with a bimodal, or generally multimodal or polymodal, particle size distribution generates a completely different type of signal fluctuation than corresponding monomodal distributions (see Figures 13, 14 . 26 and 27 ).
  • Fig. 13 shows the random distribution of luminophore particles in a 10x10 field, whereby the luminophore particles 2800 particles with a relative luminosity of 1 (small boxes in the 13), and 14 Particles with a relative luminosity of 100 (large circular spots in Fig. 13 ) include.
  • Fig. 14 shows the resulting luminescence signal (ie the measured luminescence intensity) for each of the fields 1 to 10 (Y-axis) in the rows 1 to 10 (X-axis).
  • a luminophore particle with a diameter of 10 ⁇ m has a volume a thousand times higher than a luminophore particle with a diameter of only 1 ⁇ m, and a correspondingly higher luminosity.
  • lighter energy can be emitted from surface defects without radiation ("surface quenching"), which further enhances this effect.
  • the respective larger particle class is thus able to "outshine” the smaller particle class significantly, which causes characteristic, strong increases to high signal values at measuring points which contain such particles (so-called “outliers” or “outlier signals”).
  • Suitable mathematical methods can also be used to identify characteristic fluctuation patterns caused by bimodal or polymodal grain sizes that do not contain any strong "outliers”. Because even if the grain sizes of the smaller and larger particle class are not sufficiently far apart to cause significant "outliers", the statistical parameters of such fluctuation patterns can differ significantly from those of a fluctuation pattern caused by monomodal grain size distributions.
  • the grain size distribution of the starting materials e.g. to achieve a small size distribution range and an absence of fine particles in the case of monomodal distributions of large particles, or in the case of bimodal ones Distributions to get an appropriate distance between the individual modes.
  • luminophore particles are milled, e.g. Pin mills or agitator ball mills, finely ground until the desired grain size is reached.
  • bimodal distributions or relatively narrow distributions of "large" particles e.g. in a range from 10 to 20 ⁇ m
  • the grain size distributions can be optimized by additional processes.
  • such grain size distributions can be obtained that are otherwise unusual for luminophore-based security features.
  • agglomerates Due to the clear difference in the size distribution, such agglomerates are of limited suitability for producing bimodal distributions, namely by combination with ground material with grain sizes in a range of 1 to 10 microns. It should be noted that the use of appropriately large single crystals is preferred in certain cases.
  • synthesis conditions in which e.g. bimodal products can be obtained via Ostwald ripening without additional grinding steps.
  • the synthesis conditions are optimized with regard to the growth of large crystals, which are then mixed in a suitable ratio with separately synthesized, smaller crystals or regrind.
  • a suitable bimodal distribution can also be produced by mixing material that has been ground to a very different extent. If necessary, however, a further adjustment of the grain size distributions, e.g. over dry sightings or sedimentation separation, necessary. Only in the case of host lattices with which the synthesis of larger crystallites is disproportionately complex is the above-mentioned production of agglomerates from fine material preferred over the addition of larger crystallites.
  • Fig. 26 a schematic grain size histogram (ie the plot of the relative frequency depending on the grain size) for an arbitrarily selected bimodal distribution.
  • Fig. 26 distribution shown has an overlap of the two peaks or maxima. in principle but a significantly greater overlap, or no overlap at all, of the two peaks is also possible.
  • Fig. 27 shows a hypothetical histogram of the luminescence intensities of 250 measurement points under the same conditions as that of the model of the Figures 13 and 14 ,
  • the third preferred embodiment is based on the mixing of different luminescent particles with different luminescent wavelengths (see the following exemplary embodiment).
  • a finer pigment (A1) is produced by grinding in a stirred ball mill, and a coarser pigment (A3) is produced by controlled agglomeration according to regulation 2 (see Table 2 ).
  • the identical pigments B1, B2 and B3 are produced by identical treatment of a second NIR luminescent pigment which differs from the first NIR luminescent pigment in the wavelength of the emission (1082 nm).
  • Table 2 Grain sizes of the pigments description D50 [ ⁇ m] D90 [ ⁇ m] D99 [ ⁇ m] A1 / B1 0.3 1.4 2.2 A2 / B2 2.4 7 11.4 A3 / B3 11 16 20
  • paper sheets with different combinations of an A pigment and a B pigment are produced in a sheet former.
  • the luminescent pigments are used in suitable concentrations, typically 0.1 percent by weight for the pigments A2, B2, A3 and B3, so that the average luminescence intensity is the same in all sheets.
  • the pigments A1 and B1 are dosed accordingly higher, e.g. with 0.2 percent by weight to compensate for their reduced luminescence intensity due to the small grain size.
  • the luminescence intensity of the A pigment and the B pigment at their respective emission wavelengths are then measured at several different locations (size of the measuring spot ⁇ 1 mm 2 ) on the sheet (see Figures 15 to 20 ).
  • Figures 15 to 20 show the luminescence intensity at 1000 nm (A1, A2, A3) or 1080 nm (B1, B2, B3) in each case at 100 different locations on a sheet containing the corresponding luminescent pigments.
  • the number of possible codings can be increased by a factor of 9 by including the fluctuation range as a securing criterion.
  • the nine combinations A1 + B1, A1 + B2, A1 + B3, A2 + B1, A2 + B2, A2 + B3, A3 + B1, A3 + B2, A3 + B3 can be distinguished from one another by skillfully manipulating the grain size distribution of the luminescent pigments used, although the pigment types used are each spectrally identical.
  • the fluctuation of one feature can be analyzed absolutely, relative to itself, or relative to the fluctuation of another feature.
  • absolute it is understood herein that e.g. It is checked whether the mean deviation from the signal mean value exceeds or falls below a certain absolute value, or whether the "outlier signals" which result from a bimodal distribution with large size differences lie within a certain value range of the signal intensity. It can also be analyzed whether the percentage number of measuring points with a specific property, e.g. exceeding a certain threshold lies within a defined range.
  • relative to itself refers to methods in which no absolute values are checked, but rather, for example, in which it is checked whether the mean deviation relative to the mean of the feature intensity is inside or outside a certain percentage.
  • the third method measuring fluctuation "relative to another characteristic" is particularly advantageous.
  • the cases in which external effects, such as overprinting of the banknote or a watermark (ie a local change in thickness or density in the paper substrate) have a disruptive effect on the measurements.
  • overprinting with a stripe pattern that partially absorbs the excitation wavelength causes a fluctuation in the feature signal that is not caused by the nature of the feature alone (see Figure 21 ).
  • Figure 21 shows the luminescence fluctuation caused by overprinting with a stripe pattern.
  • Figure 22 shows the elimination of overpressure effects by adding a standardization component.
  • the method is not only limited to the embodiment of such a "signal-homogeneous standard substance".
  • the relative extent of the fluctuation of two substances can also be compared.
  • the explanation in the form of point clouds can be used to explain these relationships (see Figure 23 ).
  • the position of the cloud center provides information about the mean signal intensities, and the extent of the cloud shows the extent of the signal fluctuation.
  • Figure 23 shows a point cloud representation of the signal intensities of two features at the same measuring point.
  • Figure 24 shows point clouds for different combinations of fine and coarse luminophores.
  • Idealized point clouds of further material combinations are in Figure 25 displayed. It can be clearly seen that the point clouds of different combinations differ greatly, for example in their length to width ratio or in their extent.
  • the extent of such point clouds can be recorded, for example, mathematically via the spacing of suitable quantiles in order to compare the fluctuation of the two features relative to one another and to differentiate between different codes.
  • an evaluation is also possible by combining the checking of absolute and relative limit values, as well as by combining the individual consideration of the characteristic and the comparison with one (or more) additional component (s).
  • the luminescent substances used according to the invention can be incorporated in the value document itself, in particular in the paper substrate. Additionally or alternatively, the luminescent substances can be applied to the value document (e.g. the luminescent substances can be printed on the paper substrate).
  • the value document substrate does not necessarily have to be a paper substrate, it could also be a plastic substrate or a substrate that has both paper components and plastic components.
  • the above exemplary embodiments are based on luminescent feature substances.
  • non-luminescent feature substances can also be used, which are detectable in particular by means of nuclear magnetic resonance spectroscopy, electron spin resonance spectroscopy, nuclear quadrupole resonance spectroscopy, SER (surface enhanced Raman) spectroscopy or SEIRA (surface enhanced infrared absorption) spectroscopy.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Toxicology (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Pathology (AREA)
  • Biochemistry (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Business, Economics & Management (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
  • Credit Cards Or The Like (AREA)
EP13770840.0A 2012-09-28 2013-09-27 Verfahren zur prüfung eines wertdokuments, wertdokument, verwendung desselben und wertdokumentsystem Active EP2901427B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012019247.9A DE102012019247A1 (de) 2012-09-28 2012-09-28 Verfahren zur Prüfung eines Wertdokuments, Wertdokument, Verwendung desselben und Wertdokumentsystem
PCT/EP2013/002919 WO2014048578A1 (de) 2012-09-28 2013-09-27 Verfahren zur prüfung eines wertdokuments, wertdokument, verwendung desselben und wertdokumentsystem

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EP2901427A1 EP2901427A1 (de) 2015-08-05
EP2901427B1 true EP2901427B1 (de) 2020-02-05

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Country Status (6)

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US (1) US9776450B2 (cs)
EP (1) EP2901427B1 (cs)
DE (1) DE102012019247A1 (cs)
ES (1) ES2775233T3 (cs)
IN (1) IN2015KN00552A (cs)
WO (1) WO2014048578A1 (cs)

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DE102014016858A1 (de) * 2014-02-19 2015-08-20 Giesecke & Devrient Gmbh Sicherheitsmerkmal und Verwendung desselben, Wertdokument und Verfahren zur Prüfung der Echtheit desselben
DE102017008868A1 (de) * 2017-09-21 2019-03-21 Giesecke+Devrient Currency Technology Gmbh Optischer Speicherleuchtstoff, Verfahren zum Prüfen eines Echtheitsmerkmals, Vorrichtung zum Durchführen eines Verfahrens, Echtheitsmerkmal und Wertdokument
DE102017008863A1 (de) 2017-09-21 2018-05-30 Daimler Ag Verfahren zum Betrieb eines autonom fahrenden Fahrzeugs mit einer an den Verkehr angepassten Fahrweise
EP3685864A1 (en) * 2019-01-22 2020-07-29 Fabrica Nacional De Moneda Y Timbre - Real Casa De La Moneda Use of feldspar based particles as security-markers
DE102020002587A1 (de) 2020-04-29 2021-11-04 Giesecke+Devrient Currency Technology Gmbh Verfahren und Vorrichtung zum Prüfen eines Substrats mit einem Lumineszenzstoff

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DE102005033598A1 (de) * 2005-07-19 2007-01-25 Giesecke & Devrient Gmbh Wertdokument, Herstellung und Prüfung von Wertdokumenten

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EP0947964A1 (de) 1998-03-30 1999-10-06 Ascom Autelca Ag Verfahren zum Erkennen und/oder Prüfen von Wertpapieren
DE10346636A1 (de) 2003-10-08 2005-05-12 Giesecke & Devrient Gmbh Vorrichtung und Verfahren zur Prüfung von Wertdokumenten
DE102004063217A1 (de) * 2004-12-29 2006-07-13 Giesecke & Devrient Gmbh Sicherheitsmerkmal für Wertdokumente
DE102008034021A1 (de) * 2008-07-16 2010-01-21 Merck Patent Gmbh Verfahren zur Herstellung eines Sicherheits- und/oder Wertprodukts mit Zufallsmuster und korrelierter Identzeichenfolge
US8153984B2 (en) * 2008-12-18 2012-04-10 Eastman Kodak Company Security system with different size emissive particles
DE102009058669A1 (de) * 2009-12-16 2011-06-22 Giesecke & Devrient GmbH, 81677 Echtheitsmerkmal in Form von lumineszierenden Substanzen
RU2570670C2 (ru) * 2010-07-09 2015-12-10 Гизеке Унд Девриент Гмбх Защитный признак
DE102010055976A1 (de) * 2010-12-23 2012-06-28 Giesecke & Devrient Gmbh Sicherheitsmerkmal
US9250183B2 (en) * 2011-12-19 2016-02-02 Honeywell International Inc. Luminescent materials, articles incorporating luminescent materials, and methods for performing article authentication

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WO2014048578A1 (de) 2014-04-03
US20150276601A1 (en) 2015-10-01
US9776450B2 (en) 2017-10-03
ES2775233T3 (es) 2020-07-24
DE102012019247A1 (de) 2014-04-03
EP2901427A1 (de) 2015-08-05
IN2015KN00552A (cs) 2015-07-17

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